#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;
    int a[1000];
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    int count = 0;
    bool lian = false;

    for (int i = 1; i < n; i++) {
        if (a[i] == a[i - 1] && !lian) {
            lian = !lian;
        }

        if (a[i] != a[i - 1]) {
            lian = false;
            count++;
        }
    }

    cout << ++count << endl;
    return 0;
}